Combining two hives ???

I have two hives that are very light and dought they will make it through the winter. One was a very small swarm that was given to me and the other was a cut out. Neither one built up as expected, this was back in May so they had time.
Have not been in either one (weather is not permitting, when it is sunny and hot I am in the hay field) to do a full inspection. Both are in a ten frame deep body at the moment. I did however pop the top on one of them tonight and the SHB were running everywhere, bees were pissy and I put the lid back on them. I am going to combine both of these hives and then start feeding.

Now my question..............which queen would you kill? or do I need to make an inspection before you can give an answer. I (at least for my sake) need to see how the queens are laying and what kind of stores they have (which isn't much that's for sure).